VBridger

VBridger is a program to give advanced arkit tracking to both 2d and 3d models. That tracking can be use with an Iphone this program can be launched via enabling Proton in the Steam compatibility mode, You should then be able to attach it via a port or a plugin depending on the vtubing application used, if you are having issues with the program tracking your Iphone you need to make sure that you are using the alternative 3rd Party PC clients option and to make sure you allow the connection through your distros firewall